8 pcs solid brass punches: Length: 3-1/2" Punch tip length: 1" Punch sizes: 1/16", 3/32",1/8, 5/32", 3/16",7/32", 1/4", and 5/16". 8 pcs heat treated steel punches: Length: 4" Punch sizes: 1/16", 3/32", 1/8", 5/32", 3/16",7/32",1/4", and 5/16". Spring loaded automatic center punch: Length: 5-1/2" Solid brass body with hardened steel tip. Automatic center punch is used to create dimples or impressions on soft metals, wood, etc. Brass and steel punches are used for driving out pin.